"They were of various forms, but they were of carnivorous habits, resembling the speias, and, like the nautili, living in chambered shells." — Goodrich, 1859

Ammonite

"They were of various forms, but they were of carnivorous habits, resembling the speias, and, like the…

"So called from their resemblance to a ram's horn."-Whitney, 1902

Ammonite

"So called from their resemblance to a ram's horn."-Whitney, 1902

"Ammonite is the name for a large genus of fossil chambered shells."—(Charles Leonard-Stuart, 1911)

Ammonite

"Ammonite is the name for a large genus of fossil chambered shells."—(Charles Leonard-Stuart,…

"Ammonite is the name for a large genus of fossil chambered shells."—(Charles Leonard-Stuart, 1911)

Ammonite

"Ammonite is the name for a large genus of fossil chambered shells."—(Charles Leonard-Stuart,…

"Ammonites obtusus." — Chambers' Encyclopedia, 1875

Ammonite

"Ammonites obtusus." — Chambers' Encyclopedia, 1875

"Section of Ammonites obtusus, showing the interior chambers and siphuncle." — Chambers' Encyclopedia, 1875

Ammonite

"Section of Ammonites obtusus, showing the interior chambers and siphuncle." — Chambers' Encyclopedia,…

"Ammonites nodosus." — Chambers' Encyclopedia, 1875

Ammonite

"Ammonites nodosus." — Chambers' Encyclopedia, 1875

Ammonite, side view. Where the shell has been partly worn away near the aperture, the complex "suture line" is shown.

Ammonite

Ammonite, side view. Where the shell has been partly worn away near the aperture, the complex "suture…

"Ammonites bifrons. Side view of ditto." -Taylor, 1904

Ammonite bifrons

"Ammonites bifrons. Side view of ditto." -Taylor, 1904

"Ammonites communis. Side view of ditto." -Taylor, 1904

Ammonites communis

"Ammonites communis. Side view of ditto." -Taylor, 1904

"Ammonites obtusus. Side view of ditto." -Taylor, 1904

Ammonites obtusus

"Ammonites obtusus. Side view of ditto." -Taylor, 1904

Ancyloceras, an ammonite.

Ancyloceras

Ancyloceras, an ammonite.